A range of benzotrifluorides are conveniently accessible in high yields from
diazonium salts and the inexpensive trifluoromethylating agent TMSCF3
through a copper-mediated Sandmeyer trifluoromethylation reaction. The
combination of diazotization and trifluoromethylation in a one-pot procedure
enables the trifluoromethylation of widely available (hetero)aromatic amines.